1,721,016 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Prevalence and distribution of single and multiple HPV infections in cytologically abnormal cervical samples from Italian women.
No full textThe prevalence of single and multiple HPV infections was assessed over a cohort of 213 women with cytological abnormalities and its association
with cervical neoplasia established. Roche linear arrayHPVgenotyping testwas used to identifyHPVgenotypes. The most prevalentHPVgenotypes
in cervical cancer samples were HPV16 (61.2%), HPV52 (16.1%), HPV18 (12.9%) and HPV 31 (9.6%). Multiple HR and LR HPV infections,
comprising between two and 5+ HPV types, were identified in 49.7% of samples, with a significantly lower number in severe dysplasia and cervical
cancer samples (p < 0.05).
These results seem to indicate that detection of multiple HPV infection with HR-HPV types is not significantly better as a predictor of cervical
cancer than single HR-HPV infection, though further longitudinal studies are needed to better clarify the relevance of these infections to the
progression of cervical neoplasia
Detection and genotyping of human papillomavirus in cervical samples from italian patients.
No full textHuman papillomaviruses (HPVs) are etiological
agents of cervical cancer. In order to assess the
epidemiological incidence and frequency of different
HPV types, we applied a polymerase chain
reaction (PCR)-direct sequencing approach based
on the use of MY09/MY11 primers as compared
to Hybrid Capture assay. Cervical samples were
taken from 1,500 women, both with normal and
abnormal cytological smears, and we found an
incidence of 6.6% of HPV infection in Brescia.
Overall, 97 samples tested HPV-positive, yielding
18 HPV types. The four most frequent HPV types
were: HPV 16, -31, -6, and -58. This approach
could be used in ordinary laboratory settings for
quick and reliable typing of known and novel
HPVs from clinical specimens and it could also
be applied to anti-cancer vaccine development
Comparison of the AMPLICOR Human Papillomavirus Test and the Hybrid Capture 2 Assay for detection of high-risk human papillomavirus in women with abnormal PAP smear
No full textInfection with human papillomavirus (HPV) is a necessary step in the progression to cervical cancer. Many methods for HPV testing are
currently available, mostly developed to detect pools of HPV types. Hybrid Capture 2 (HC2) is one of the most widely used. A new PCR-based
assay, the Roche AMPLICOR HPV test, has been recently developed. Both assays recognize a group of 13 HR HPV types contemporaneously.
This study evaluated the performance of both methods for detecting high-grade cervical lesions as a part of management for abnormal PAP
smears. The study population was composed of 213 women, all referred to colposcopy and histologic diagnosis following an abnormal PAP test.
Biopsy-confirmed high-grade cervical intraepithelial neoplasia was used as a gold standard. Overall agreement was 84.9% with a kappa value of
0.6. When comparing the ability to detect moderate cervical intraepithelial neoplasia (CIN2+) and high-grade cervical intraepithelial neoplasia
(CIN3+/cancer), AMPLICOR proved slightly more sensitive than HC2, a finding that is important when HPV testing is used in a triage of borderline
smear results. Genotyping of discordant results showed a prevalence of LR-HPV types in HC2 positive/AMPLICOR negative samples, and a similar
prevalence of HR- and LR-HPV types in AMPLICOR positive/HC2 negative samples. In conclusion, the study shows that the AMPLICOR assay
is more sensitive than HC2, which makes it a valid alternative for routine clinical use
Prevaccination distribution of human papillomavirus types in Italian women with high-risk lesions and cervical neoplasia.
No full textDispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
- …
